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Dividends (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Supplemental Cash Flow Elements [Abstract]
Dividends related to outstanding restricted stock units	$ 0.3

X

- Definition

Amount of dividends accrued on unvested restricted stock units to be paid upon vesting.

+ References

No definition available.

+ Details

Name:	cnk_DividendsAccruedOnUnvestedRestrictedStockUnits
Namespace Prefix:	cnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_SupplementalCashFlowElementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration